<template>
  <div>
    <!-- 卡片组件， shadow="never" 指定 card 卡片组件没有阴影 -->
    <el-card shadow="never">
      <el-radio-group v-model="labelPosition" label="label position" class="mb-5">
        <el-radio-button size="small" label="left">
          <el-icon>
            <CaretLeft/>
          </el-icon>
        </el-radio-button>
        <el-radio-button size="small" label="right">
          <el-icon>
            <CaretRight/>
          </el-icon>
        </el-radio-button>
        <el-radio-button size="small" label="top">
          <el-icon>
            <CaretTop/>
          </el-icon>
        </el-radio-button>
      </el-radio-group>
      <el-form ref="formRef" :model="form" label-width="160px" :rules="rules" :label-position="labelPosition">
        <el-form-item label="博客名称" prop="name">
          <el-input v-model="form.name" clearable/>
        </el-form-item>
        <el-form-item label="作者名" prop="author">
          <el-input v-model="form.author" clearable/>
        </el-form-item>
        <el-form-item label="介绍语" prop="introduction">
          <el-input v-model="form.introduction" type="textarea"/>
        </el-form-item>
        <!-- 图片上传组件-->
        <el-form-item label="博客 LOGO" prop="logo">
          <el-upload class="avatar-uploader" action="#"
                     :on-change="handleLogoChange" :auto-upload="false"
                     :show-file-list="false">
            <img v-if="form.logo" :src="form.logo" class="avatar" />
            <el-icon v-else class="avatar-uploader-icon">
              <Plus />
            </el-icon>
          </el-upload>
        </el-form-item>
        <el-form-item label="作者头像" prop="avatar">
          <el-upload class="avatar-uploader" action="#"
                     :on-change="handleAvatarChange" :auto-upload="false"
                     :show-file-list="false">
            <img v-if="form.avatar" :src="form.avatar" class="avatar" />
            <el-icon v-else class="avatar-uploader-icon">
              <Plus />
            </el-icon>
          </el-upload>
        </el-form-item>
        <!-- 开启 Github 访问 -->
        <el-form-item label="开启 GihHub 访问">
          <el-switch v-model="isGithubChecked" inline-prompt :active-icon="Check" :inactive-icon="Close"
                     @change="githubSwitchChange" />
        </el-form-item>
        <el-form-item label="GitHub 主页访问地址" v-if="isGithubChecked">
          <el-input v-model="form.githubHomepage" clearable placeholder="请输入 GitHub 主页访问的 URL" />
        </el-form-item>

        <!-- 开启 Gitee 访问 -->
        <el-form-item label="开启 Gitee 访问">
          <el-switch v-model="isGiteeChecked" inline-prompt :active-icon="Check" :inactive-icon="Close"
                     @change="giteeSwitchChange" />
        </el-form-item>
        <el-form-item label="Gitee 主页访问地址" v-if="isGiteeChecked">
          <el-input v-model="form.giteeHomepage" clearable placeholder="请输入 Gitee 主页访问的 URL" />
        </el-form-item>

        <!-- 开启知乎访问 -->
        <el-form-item label="开启知乎访问">
          <el-switch v-model="isZhihuChecked" inline-prompt :active-icon="Check" :inactive-icon="Close"
                     @change="zhihuSwitchChange" />
        </el-form-item>
        <el-form-item label="知乎主页访问地址" v-if="isZhihuChecked">
          <el-input v-model="form.zhihuHomepage" clearable placeholder="请输入知乎主页访问的 URL" />
        </el-form-item>

        <!-- 开启 CSDN 访问 -->
        <el-form-item label="开启 CSDN 访问">
          <el-switch v-model="isCSDNChecked" inline-prompt :active-icon="Check" :inactive-icon="Close"
                     @change="csdnSwitchChange" />
        </el-form-item>
        <el-form-item label="CSDN 主页访问地址" v-if="isCSDNChecked">
          <el-input v-model="form.csdnHomepage" clearable placeholder="请输入 CSDN 主页访问的 URL" />
        </el-form-item>
        <el-form-item class="cursor-pointer">
          <el-button size="large" type="primary" :loading="btnLoading" @click="onSubmit">保存</el-button>
        </el-form-item>
      </el-form>
    </el-card>
  </div>
</template>

<script setup>
import {onMounted, reactive, ref} from 'vue'
import { Check, Close } from '@element-plus/icons-vue'
import { getBlogSettingsDetail, updateBlogSettings } from '@/api/admin/blogsetting'
import { uploadFile } from '@/api/admin/file'
import { showMessage } from '@/composables/util'
// 表单对象
const form = reactive({
  name: '',
  author: '',
  logo: '',
  avatar: '',
  introduction: '',
  githubHomepage: '',
  giteeHomepage: '',
  zhihuHomepage: '',
  csdnHomepage: '',
})

// 是否显示保存按钮的 loading 状态，默认为 false
const btnLoading = ref(false)

// 表单引用
const formRef = ref(null)

// 规则校验
const rules = {
  name: [{required: true, message: '请输入博客名称', trigger: 'blur'}],
  author: [{required: true, message: '请输入作者名', trigger: 'blur'}],
  logo: [{required: true, message: '请上传博客 LOGO', trigger: 'blur'}],
  avatar: [{required: true, message: '请上传作者头像', trigger: 'blur'}],
  introduction: [{required: true, message: '请输入介绍语', trigger: 'blur'}],
}

const labelPosition = ref("right")

// 是否开启 GitHub
const isGithubChecked = ref(false)
// 是否开启 Gitee
const isGiteeChecked = ref(false)
// 是否开启知乎
const isZhihuChecked = ref(false)
// 是否开启 CSDN
const isCSDNChecked = ref(false)

onMounted(() => {
  initBlogSettings()
})

// 监听 Github Switch 改变事件
const githubSwitchChange = (checked) => {
  if (checked === false) {
    form.githubHomepage = ''
  }
}

// 监听 Gitee Switch 改变事件
const giteeSwitchChange = (checked) => {
  if (checked === false) {
    form.giteeHomepage = ''
  }
}

// 监听知乎 Switch 改变事件
const zhihuSwitchChange = (checked) => {
  if (checked === false) {
    form.zhihuHomepage = ''
  }
}

// 监听 CSDN Switch 改变事件
const csdnSwitchChange = (checked) => {
  if (checked === false) {
    form.csdnHomepage = ''
  }
}


// ==============================================
// 渲染博客信息
function initBlogSettings() {
  // 请求后台接口
  getBlogSettingsDetail().then((res) => {
    if (res.success === true) {
      // 设置表单数据
      form.name = res.data.name
      form.author = res.data.author
      form.logo = res.data.logo
      form.avatar = res.data.avatar
      form.introduction = res.data.introduction

      // 第三方平台信息设置，先判断后端返回平台链接是否为空，若不为空，则将 switch 组件置为选中状态，并设置表单对应数据
      if (res.data.githubHomepage) {
        isGithubChecked.value = true
        form.githubHomepage = res.data.githubHomepage
      }

      if (res.data.giteeHomepage) {
        isGiteeChecked.value = true
        form.giteeHomepage = res.data.giteeHomepage
      }

      if (res.data.zhihuHomepage) {
        isZhihuChecked.value = true
        form.zhihuHomepage = res.data.zhihuHomepage
      }

      if (res.data.csdnHomepage) {
        isCSDNChecked.value = true
        form.csdnHomepage = res.data.csdnHomepage
      }
    }
  })
}

// 上传 logo 图片
const handleLogoChange = (file) => {
  // 表单对象
  let formData = new FormData()
  // 添加 file 字段，并将文件传入
  formData.append('file', file.raw)
  uploadFile(formData).then((e) => {
    // 响参失败，提示错误消息
    if (e.success === false) {
      let message = e.message
      showMessage(message, 'error')
      return
    }

    // 成功则设置 logo 链接，并提示成功
    form.logo = e.data.url
    showMessage('上传成功')
  })
}

const handleAvatarChange = (file) => {
  // 表单对象
  let formData = new FormData()
  // 添加 file 字段，并将文件传入
  formData.append('file', file.raw)
  uploadFile(formData).then((e) => {
    // 响参失败，提示错误消息
    if (e.success === false) {
      let message = e.message
      showMessage(message, 'error')
      return
    }

    // 成功则设置作者头像链接，并提示成功
    form.avatar = e.data.url
    showMessage('上传成功')
  })
}

// 提交更新方法
// 保存当前博客设置
const onSubmit = () => {
  // 先验证 form 表单字段
  formRef.value.validate((valid) => {
    if (!valid) {
      console.log('表单验证不通过')
      return false
    }

    // 显示保存按钮 loading
    btnLoading.value = true
    updateBlogSettings(form).then((res) => {
      if (res.success === false) {
        // 获取服务端返回的错误消息
        let message = res.message
        // 提示错误消息
        showMessage(message, 'error')
        return
      }

      // 重新渲染页面中的信息
      initBlogSettings()
      showMessage('保存成功')
    }).finally(() => btnLoading.value = false) // 隐藏保存按钮 loading
  })
}

</script>

<style scoped>
.avatar-uploader .avatar {
  width: 100px;
  height: 100px;
  display: block;
}
</style>

<style>
/* 解决 textarea :focus 状态下，边框消失的问题 */
.el-textarea__inner:focus {
  outline: 0 !important;
  box-shadow: 0 0 0 1px var(--el-input-focus-border-color) inset !important;
}

.avatar-uploader .el-upload {
  border: 1px dashed var(--el-border-color);
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: var(--el-transition-duration-fast);
}

.avatar-uploader .el-upload:hover {
  border-color: var(--el-color-primary);
}

.el-icon.avatar-uploader-icon {
  font-size: 28px;
  color: #8c939d;
  width: 100px;
  height: 100px;
  text-align: center;
}
</style>